0 If a light or a machine goes off, it stops working. -- (電燈)熄滅;(機器)停止運行,停止運轉
1 If a bomb goes off, it explodes. -- 爆炸
His gun went off accidentally. 他的槍不小心走火了。
2 If food or drink goes off, it is not good to eat or drink any more because it is too old. -- (食物、飲料等)變質,變壞,腐敗
3 If a warning device goes off, it starts to ring loudly or make a loud noise. -- (警報器等)突然發出巨響
5 to happen in a particular way -- 發生;進展